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/*
 * @(#)DurationParser.java	2021-8-24
 *
 * Copyright (c) 2021. All Rights Reserved.
 *
 */

package com.github.javaclub.configcenter.client.domain;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.github.javaclub.configcenter.client.ParserException;

/**
 * DurationParser
 *
 * @author Gerald Chen
 * @version $Id: DurationParser.java 2021-8-24 16:30:10 Exp $
 */
public enum DurationParser {

	INSTANCE;

	private static final Pattern PATTERN = Pattern.compile(
			"(?:([0-9]+)D)?(?:([0-9]+)H)?(?:([0-9]+)M)?(?:([0-9]+)S)?(?:([0-9]+)(?:MS)?)?", Pattern.CASE_INSENSITIVE);

	private static final int HOURS_PER_DAY = 24;
	private static final int MINUTES_PER_HOUR = 60;
	private static final int SECONDS_PER_MINUTE = 60;
	private static final int MILLIS_PER_SECOND = 1000;
	private static final int MILLIS_PER_MINUTE = MILLIS_PER_SECOND * SECONDS_PER_MINUTE;
	private static final int MILLIS_PER_HOUR = MILLIS_PER_MINUTE * MINUTES_PER_HOUR;
	private static final int MILLIS_PER_DAY = MILLIS_PER_HOUR * HOURS_PER_DAY;

	public long parseToMillis(String text) throws ParserException {
		Matcher matcher = PATTERN.matcher(text);
		if (matcher.matches()) {
			String dayMatch = matcher.group(1);
			String hourMatch = matcher.group(2);
			String minuteMatch = matcher.group(3);
			String secondMatch = matcher.group(4);
			String fractionMatch = matcher.group(5);
			if (dayMatch != null || hourMatch != null || minuteMatch != null || secondMatch != null
					|| fractionMatch != null) {
				int daysAsMilliSecs = parseNumber(dayMatch, MILLIS_PER_DAY);
				int hoursAsMilliSecs = parseNumber(hourMatch, MILLIS_PER_HOUR);
				int minutesAsMilliSecs = parseNumber(minuteMatch, MILLIS_PER_MINUTE);
				int secondsAsMilliSecs = parseNumber(secondMatch, MILLIS_PER_SECOND);
				int milliseconds = parseNumber(fractionMatch, 1);

				return daysAsMilliSecs + hoursAsMilliSecs + minutesAsMilliSecs + secondsAsMilliSecs + milliseconds;
			}
		}
		throw new ParserException(String.format("Text %s cannot be parsed to duration)", text));
	}

	private static int parseNumber(String parsed, int multiplier) {
		// regex limits to [0-9]+
		if (parsed == null || parsed.trim().isEmpty()) {
			return 0;
		}
		return Integer.parseInt(parsed) * multiplier;
	}
}